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androidviewdrag-and-drop
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Reputation: 6531

Android 3 : Drag-and-Drop Views

I'm trying to use Android's new Drag&Drop framework and I run into the following issue:

I'm operating inside of one single Activity, so Class Sources are available.

Upvotes: 0

Views: 1525

Answers (2)

Neilers
Neilers

Reputation: 421

You could try a number of things. In my app, this is how i did it:

public boolean onLongClick(View v)
    {
    dragged_view = v;       
    removeTransition(v);

    ClipData data = ClipData.newPlainText("path", ((TextView)v.findViewById(R.id.file_name)).getText());
    v.startDrag(data, new Shadow(v, c), v, 0);

    return true;
    }

I trigger the drag even on a long click gesture. I have a global View variable named dragged_view so that I can reference it on ACTION_DROP.

Another thing I did is pass the View as the local state object in the startDrag() method (it's the 3rd argument). I can then get it via getLocalState() and use it for reference, as in this code snippet:

item_drag_listener = new View.OnDragListener(){
        public boolean onDrag(View v, DragEvent event){
            if (event.getLocalState() == v)
                return true;
            overlays = v.findViewById(R.id.copy_move_overlays);
            switch (event.getAction()){
                case DragEvent.ACTION_DRAG_ENTERED:
                    overlays.setVisibility(View.VISIBLE);
                    break;
                case DragEvent.ACTION_DRAG_EXITED:
                    overlays.setVisibility(View.INVISIBLE);
                    break;
                case DragEvent.ACTION_DRAG_STARTED:
                    return true;
                case DragEvent.ACTION_DROP:
                    return true;
                }
            return false;
            }
        };

Upvotes: 1

Skip
Skip

Reputation: 6531

I implemented dragging and dropping a view, by introducing a DragHandler class with a variable

View isDraggedNow;

This Variable allwasy contains a dragged view, so every class can easily take it on DragEvent.ACTION_DRAG_ENTERED

Upvotes: 0

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